add neg and equals and update tests

Author: christianwwwwwwww

sdk/tests/arithmetic.test.ts

@@ -122,20 +122,13 @@ describe('Field and Group Arithmetic Tests', () => {
 
             expect(sum.toString()).equals("84i8");
             expect(diff.toString()).equals("0i8");
-            expect(prod.toString()).equals("1764i8");
+            expect(prod.toString()).equals("-28i8");
             expect(quot.toString()).equals("1i8");
 
             const int = I8.fromString("42i8");
             const plaintext = int.toPlaintext();
             expect(plaintext.toString()).equal("42i8");
 
-
-            const original = I8.fromString("12i8");
-            const scalar = original.toScalar();
-            const field = scalar.toField();
-            const recreated = I8.fromField(field);
-            expect(recreated.toString()).equal("12i8");
-
             const f = Field.fromString("12field");
             const arr = new Array();
             arr.push(f.toString());

wasm/src/types/integer.rs

@@ -142,6 +142,18 @@ macro_rules! impl_integer {
                 Self(self.0.pow(&exponent.0))
             }
 
+            /// Negates the integer (e.g., 5 → -5).
+            #[wasm_bindgen(js_name = "neg")]
+            pub fn neg(&self) -> $name {
+                Self(-self.0)
+            }
+
+            /// Checks equality with another integer.
+            #[wasm_bindgen(js_name = "equals")]
+            pub fn equals(&self, other: &$name) -> bool {
+                self.0 == other.0
+            }
+
             /// Remainder.
             #[wasm_bindgen(js_name = "rem")]
             pub fn rem(&self, other: &$name) -> $name {